安卓系统中的java.lang.ExceptionInInitializerError

Question

我正在尝试创建一个Android应用程序来验证一个脸，但是当我尝试在我的模拟器上运行我的应用程序(使用Eclipse)时，我的logcat中有这样的结果：

       06-16 14:51:24.326: E/AndroidRuntime(4305): FATAL EXCEPTION: main
06-16 14:51:24.326: E/AndroidRuntime(4305): Process: com.neurotec.samples.faceverification, PID: 4305
06-16 14:51:24.326: E/AndroidRuntime(4305): java.lang.ExceptionInInitializerError
06-16 14:51:24.326: E/AndroidRuntime(4305):     at com.neurotec.view.NGui.<clinit>(NGui.java:56)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at com.neurotec.view.NViewBase.<clinit>(NViewBase.java:30)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at java.lang.reflect.Constructor.constructNative(Native Method)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at android.view.LayoutInflater.createView(LayoutInflater.java:594)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:696)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:341)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at android.app.Activity.setContentView(Activity.java:1975)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at com.neurotec.samples.faceverification.FaceVerificationApplication.onCreate(FaceVerificationApplication.java:46)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at android.app.Activity.performCreate(Activity.java:5370)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1088)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2331)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2422)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at android.app.ActivityThread.access$800(ActivityThread.java:151)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1342)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at android.os.Handler.dispatchMessage(Handler.java:110)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at android.os.Looper.loop(Looper.java:193)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at android.app.ActivityThread.main(ActivityThread.java:5330)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at java.lang.reflect.Method.invokeNative(Native Method)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at java.lang.reflect.Method.invoke(Method.java:515)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:828)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:644)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at dalvik.system.NativeStart.main(Native Method)
06-16 14:51:24.326: E/AndroidRuntime(4305): Caused by: java.lang.ExceptionInInitializerError
06-16 14:51:24.326: E/AndroidRuntime(4305):     at com.neurotec.media.NMedia.<clinit>(NMedia.java:49)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at com.neurotec.view.NGui.<clinit>(NGui.java:47)
06-16 14:51:24.326: E/AndroidRuntime(4305):     ... 26 more
06-16 14:51:24.326: E/AndroidRuntime(4305): Caused by: java.lang.ExceptionInInitializerError
06-16 14:51:24.326: E/AndroidRuntime(4305):     at com.neurotec.lang.NCore.<clinit>(NCore.java:140)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at com.neurotec.lang.NTypes.<clinit>(NTypes.java:171)
06-16 14:51:24.326: E/AndroidRuntime(4305):     at com.neurotec.media.NMedia.<clinit>(NMedia.java:46)
06-16 14:51:24.326: E/AndroidRuntime(4305):     ... 27 more
06-16 14:51:24.326: E/AndroidRuntime(4305): Caused by: java.lang.NoClassDefFoundError: com.sun.jna.Platform
06-16 14:51:24.326: E/AndroidRuntime(4305):     at com.neurotec.lang.NCore.<clinit>(NCore.java:123)
06-16 14:51:24.326: E/AndroidRuntime(4305):     ... 29 more

FaceVerificationApplication.java的代码如下：

public class FaceVerificationApplication extends BaseActivity implements
        EnrollmentDialogListener, UserSelectionListener {

    // ===========================================================
    // Private fields
    // ===========================================================

    private static final String EXTRA_REQUEST_CODE = "request_code";
    private static final int VERIFICATION_REQUEST_CODE = 1;
    private static final int TIMEOUT = 60000;
    private boolean mAppClosing;
    private NFaceVerificationView mFaceView;

    // ===========================================================
    // Protected methods
    // ===========================================================

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_nlvdemo);
        // on application start you must set NCore context
        NCore.setContext(this);

        new Thread(new Runnable() {

            @Override
            public void run() {
                try {
                    showProgress(R.string.msg_initialising);

                    // get NFV for the first time
                    final NFaceVerification nfv = NFV.getInstance();

                    // load settings
                    SettingsFragment.loadSettings();

                    // button implementations
                    Button mEnrollButton = (Button) findViewById(R.id.button_enroll);
                    mEnrollButton
                            .setOnClickListener(new View.OnClickListener() {

                                @Override
                                public void onClick(View v) {
                                    EnrollmentDialogFragment enrollDialog = new EnrollmentDialogFragment();
                                    enrollDialog.show(getFragmentManager(),
                                            "enrollment");
                                }
                            });

                    Button mCancelButton = (Button) findViewById(R.id.button_cancel);
                    mCancelButton
                            .setOnClickListener(new View.OnClickListener() {

                                @Override
                                public void onClick(View v) {
                                    showProgress(R.string.msg_cancelling);
                                    nfv.cancel();
                                    hideProgress();
                                }
                            });

                    Button mVerifyButton = (Button) findViewById(R.id.button_verify);
                    mVerifyButton
                            .setOnClickListener(new View.OnClickListener() {

                                @Override
                                public void onClick(View v) {
                                    Bundle bundle = new Bundle();
                                    bundle.putInt(EXTRA_REQUEST_CODE,
                                            VERIFICATION_REQUEST_CODE);
                                    UserListFragment userList = (UserListFragment) UserListFragment
                                            .newInstance(nfv.getUsers(), true,
                                                    bundle);
                                    userList.show(getFragmentManager(),
                                            "verification");
                                }
                            });

                    // set frontal camera
                    String[] names = nfv.getAvailableCameraNames();
                    for (String n : names) {
                        if (n.contains("Front")) {
                            nfv.setCamera(n);
                            break;
                        }
                    }

                    mFaceView = (NFaceVerificationView) findViewById(R.id.nFaceView);
                    nfv.addCapturePreviewListener(new NFaceVerificationCapturePreviewListener() {

                        @Override
                        public void capturePreview(
                                NFaceVerificationCapturePreviewEvent arg0) {
                            mFaceView.setEvent(arg0);
                        }
                    });

                    hideProgress();
                } catch (Exception ex) {
                    hideProgress();
                    showError(ex);
                }
            }

        }).start();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.nlvdemo, menu);
        return true;
    }

    @Override
    public void onBackPressed() {
        super.onBackPressed();
        mAppClosing = true;
    }

    @Override
    public void onEnrollmentIDProvided(final String id) {
        new Thread(new Runnable() {

            @Override
            public void run() {
                try {
                    // cancel in there are any other operations in progress
                    NFV.getInstance().cancel();
                    NFaceVerificationStatus status = NFV.getInstance().enroll(
                            id, TIMEOUT, null);
                    showInfo(String.format(
                            getString(R.string.msg_operation_status),
                            status.toString()));
                } catch (Throwable e) {
                    showError(e);
                }
            }
        }).start();
    };

    @Override
    public void onUserSelected(final NFaceVerificationUser user, Bundle bundle) {
        new Thread(new Runnable() {

            @Override
            public void run() {
                try {
                    // cancel in there are any other operations in progress
                    NFV.getInstance().cancel();
                    NFaceVerificationStatus status = NFV.getInstance().verify(
                            user.getId(), TIMEOUT);
                    showInfo(String.format(
                            getString(R.string.msg_operation_status),
                            status.toString()));
                } catch (Throwable e) {
                    showError(e);
                }
            }
        }).start();
    };

    @Override
    protected void onStop() {
        if (mAppClosing) {
            NFV.getInstance().cancel();
            NFV.dispose();
        }
        super.onStop();
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        if (id == R.id.action_clear_db) {
            new Thread(new Runnable() {

                @Override
                public void run() {
                    // cancel if there are any other operations in progress
                    NFV.getInstance().cancel();
                    NFV.getInstance().getUsers().clear();
                }
            }).start();
            return true;
        } else if (id == R.id.action_settings) {
            Intent intent = new Intent(this, SettingsActivity.class);
            startActivity(intent);

            return true;
        }
        return super.onOptionsItemSelected(item);
    }

}

我如何解决这个异常？任何建议都是很有帮助的。

Answer 1

嗨，我的问题解决了。我必须将jna-4.2.2.jar添加到我的项目中。我在jna.jar中有关于本机库的错误。所以在这种情况下，在Eclipse中，我必须转到Preferences > Android > Build > uncheck“当外部jars包含本机库时的强制错误”，就解决了。

Answer 2

这是答案，所以你现在知道怎么解决了。但这是给别人的。Java有一个很好的异常消息处理，您可以在那里找到修复它所需的几乎所有东西。这只是我的意见和建议：每时每刻看看由: part.引起的

当您有异常时，请看最后由消息引起的结果。例如，下面是它:由: java.lang.NoClassDefFoundError: com.sun.jna.Platform引起的。Java有很多错误类。这是来自Object->Throwable->Error->LinkageError.的错误运行时错误=>问题，没有类Def发现错误是类加载程序的典型问题。您需要解释的所有错误都在java文档中。

顺便提一下，这里是添加外部库的解决方案。

如何将库添加到ECLIPSE中的项目：下载jar，这个jar是由其他人在这里删除的(jna.jar)，并将其添加到lib文件夹中，然后您必须将它添加到构建路径中(然后类加载程序将能够找到它并解决您的问题)。如果您正在使用Eclipse，您可以通过Eclipse直接将它们导入到lib文件夹(右键单击项目文件夹，选择buildpath、库选项卡和添加jar)，或者直接将jar复制到lib文件夹，然后右键单击并构建路径->添加到Buildpath。

Answer 3

正如其他人已经指出的，您缺少了一个名为Java本地访问(JNA)的项目的依赖项。如果仔细查看您的StackTrace，您会在最后看到这个例外：java.lang.NoClassDefFoundError: com.sun.jna.Platform。一个简短的Google搜索在上面的存储库中结束。

我会尝试使用带有Android前缀的下载所有相关的jars。您还可能只需要使用android-arm.jar，但是这会在另一个处理器的设备上破坏它，所以将它们全部添加进去。